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I'm not too sure I'm completely understanding here, but what about a normal gravel vac that has the larger rigid tube on the end of it

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease."Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony CalfoFishless CycleCycling with FishMarine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]

The fry tank is bare bottom. And I don't use a gravel vacuum because as careful as i try to be..i still usually have at least one fry who gets sucked through my airline tube into the bucket and it wouldn't survive going through a gravel vacuum.

So....you don't want to use a gravel vac, you want rigid tubing for your airline tube? They sell those for under gravel filters. Little rigid parts that connect to the airstone, I've seen them from 6-18" long.

What I use in some of my small fry tanks is a $1 dollar store turkey baster, yep a turkey baster, may sound a bit silly but they work perfect for cleaning out small tanks. Able to get the debris out and keep the fry safe. You can remove the bulb from the turkey baster and attach some plastic tubing to it. Also find it useful to drain the turkey baster/hose into a white bucket, and afterwards look there for any fry that may have gotten sucked up.